Structure Determination of Brominated Morphinan-6-ones by13C-NMR. Spectroscopy: A novel closure of the oxygen bridge using 4-acetoxymorphinan-6-ones
作者:Arnold Brossi、Fu-Lian Hsu、Kenner C. Rice、Maria D. Rozwadowska、Helmut Schmidhammer、Charles D. Hufford、Chian Chian Chiang、Isabella L. Karle
DOI:10.1002/hlca.19810640545
日期:1981.7.22
Bromination of (−)-4-hydroxy-N-methylmorphinan-6-one (3), prepared from natural morphine, with 1 mol of bromine in acetic acid, afforded the 1-bromo ketone 5. The structure of 5 was assigned by 13C-NMR.spectroscopy, and confirmed by X-ray diffraction analysis of its hydrobromide salt. It is suggested that monobromination of synthetic (±)-2,4-dihydroxy-N-formylmorphinan-6-one (7) takes in principle